US 12,434,455 B2
Multilayer foam sheet and adhesive tape
Kento Sato, Tokyo (JP); Hiroki Matsukawa, Koshigaya (JP); and Masahiro Hamada, Shiraoka (JP)
Assigned to SEKISUI CHEMICAL CO., LTD., Osaka (JP)
Appl. No. 18/031,463
Filed by SEKISUI CHEMICAL CO., LTD., Osaka (JP)
PCT Filed Oct. 6, 2021, PCT No. PCT/JP2021/037064
§ 371(c)(1), (2) Date Apr. 12, 2023,
PCT Pub. No. WO2022/080219, PCT Pub. Date Apr. 21, 2022.
Claims priority of application No. 2020-173425 (JP), filed on Oct. 14, 2020; application No. 2021-030594 (JP), filed on Feb. 26, 2021; and application No. 2021-162408 (JP), filed on Sep. 30, 2021.
Prior Publication US 2023/0382082 A1, Nov. 30, 2023
Int. Cl. B32B 5/32 (2006.01); B32B 5/18 (2006.01); B32B 7/02 (2019.01); B32B 27/06 (2006.01); B32B 27/16 (2006.01); B32B 27/32 (2006.01); C09J 7/26 (2018.01); C09J 7/38 (2018.01)
CPC B32B 5/32 (2013.01) [B32B 5/18 (2013.01); B32B 7/02 (2013.01); B32B 27/065 (2013.01); B32B 27/16 (2013.01); B32B 27/32 (2013.01); C09J 7/26 (2018.01); C09J 7/38 (2018.01); B32B 2250/42 (2013.01); B32B 2266/025 (2013.01); B32B 2266/08 (2013.01); B32B 2266/104 (2016.11); B32B 2274/00 (2013.01); B32B 2307/54 (2013.01); B32B 2307/542 (2013.01); B32B 2307/72 (2013.01); B32B 2307/7376 (2023.05); B32B 2405/00 (2013.01); C09J 2301/16 (2020.08); C09J 2423/006 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A multilayer foam sheet comprising: a base layer comprising a foam layer; and a surface layer comprising a foam layer or a resin film, the surface layer being laminated on each of both sides of the base layer,
wherein the multilayer foam sheet has a low-speed shear modulus being 50 MPa or more,
wherein the multilayer foam sheet has a 25% compressive strength being 125 kPa or less,
wherein, the multilayer foam sheet, a ratio of a thickness of the base layer to a thickness of the surface layer (thickness of base layer/thickness of surface layer) is 4.0 or more, and
wherein the multilayer foam sheet has a gel fraction from 30 to 80%.